I'm sitting with this type of charger because i want to diagnose if it's failing,
for a T410s and wondering why i get zero volts if i try to measure voltage output, am i doing it wrong?
https://www.ebay.com.au/itm/20V-4-5A-Ac ... 3078194329
I use a Multimeter and do the following
1) I connect a red plug to the inside of the yellow charger head (the pin inside the charger)
and connect the black ground to the metal outside of the charge. But i always get zero voltage, if i set it in measure corrent mode
I get a spark. If i connect Charger to Motherboard i do get voltage readings from the motherboard. So how do i correctly measure the voltage output of a Lenovo Charger?
T21 2647 T22 2647 1@ 1GHz SXGA+ 4 more; T23 2647 1@ 1.2GHz SXGA+ 3 more
T30 2366-88U 2GHz; 2366-83U 1.8G; 5@ 2366-LU0/66U; 2367-KU6 FUBARd
T41 T42 T43
T61 8897 2.4GHz SXGA+; 8898 2.4Ghz; 6463 2@ WSXGA+; 7658 2.5GHz; T61p; 6 more T61s
It's strange: Sometimes i get 20.3 and sometimes 20.2 it jumps up and down.
Is it a bad sign when i do measurements of motherboard or charger if the decimal values change by one value or jump like that?
The miniscule variance in measured voltage doesn't bother me at all. Think that's okay.
I'd still prefer an original charger any day of the week to a knock off, just because. Think original should be pretty cheap for both 65Wt and 90Wt. The one you have btw proclaims itself to be a 90Wt (20*4.5 = 90).
And given that you already have one Thinkpad that has mysteriously failed and that the failure could well be related to power supply circuits.. I'd definitely consider switching to Lenovo-branded chargers. Any Lenovo charger with a round-barrel output will work for you. Okay maybe 90Wt is preferred to 65Wt especially for home use. Doesn't hurt to have a little more omph. And maybe a 65Wt for walking about town since it's smaller/lighter
Do you think this might be the problem? I would think all 3 pins have to output 20 Volt right? (yes I really want to learn this )
tagunov: Good point on having an actual charger from the original company, there are so many chargers it's easy to get confused at times
The plug has 3 contacts: inner and outer round metal bands and the pin in the centre. The role of the pin in the centre is quite special. Somewhere inside the plug sitting on the end of the wire coming form the PSU there may be a hidden resistor. The nominal of this resistor tells Thinkpad what kind of charger it is: is it a 65Wt charger? A 90Wt? A 135Wt? This tells Thinkpad how much Wt it is okay to pull from the charger. And Thinkpad measures that resistor. To measure that resistor Thinkpad arranges for some current to flow through it. The voltages you're seeing: 1.5V, 7.5V are probably the result of this measuring activity.
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